lily/separating-group-spanner.cc

   1 /*
   2   separating-group-spanner.cc --  implement Separating_group_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "separating-group-spanner.hh"
  11 #include "separation-item.hh"
  12 #include "paper-column.hh"
  13 #include "paper-def.hh"
  14 #include "dimensions.hh"
  15 #include "group-interface.hh"
  16
  17 static void
  18 do_rod (Item *l, Item *r)
  19 {
  20   Rod rod;
  21
  22   Interval li (Separation_item::my_width (l));
  23   Interval ri (Separation_item::my_width (r));
  24
  25   rod.item_l_drul_[LEFT] =l;
  26   rod.item_l_drul_[RIGHT]=r;
  27
  28   if (li.empty_b () || ri.empty_b ())
  29     rod.distance_f_ = 0;
  30   else
  31     rod.distance_f_ = li[RIGHT] - ri[LEFT];
  32
  33   rod.columnize ();
  34   rod.add_to_cols ();
  35 }
  36
  37 MAKE_SCHEME_CALLBACK(Separating_group_spanner,set_spacing_rods,1);
  38 SCM
  39 Separating_group_spanner::set_spacing_rods (SCM smob)
  40 {
  41   Score_element*me = unsmob_element (smob);
  42
  43   for (SCM s = me->get_elt_property ("elements"); gh_pair_p (s) && gh_pair_p (gh_cdr (s)); s = gh_cdr (s))
  44     {
  45       /*
  46         Order of elements is reversed!
  47        */
  48       SCM elt = gh_cadr (s);
  49       SCM next_elt = gh_car (s);
  50
  51       Item *l = dynamic_cast<Item*> (unsmob_element (elt));
  52       Item *r = dynamic_cast<Item*> (unsmob_element ( next_elt));
  53
  54       if (!r || !l)
  55         continue;
  56
  57       Item *lb
  58         = dynamic_cast<Item*>(l->find_prebroken_piece (RIGHT));
  59
  60       Item *rb
  61         = dynamic_cast<Item*>(r->find_prebroken_piece (LEFT));
  62
  63       do_rod(l,  r);
  64       if (lb)
  65         {
  66           do_rod (lb, r);
  67         }
  68
  69       if (rb)
  70         {
  71           do_rod (l, rb);
  72         }
  73
  74       if (lb && rb)
  75         {
  76           do_rod (lb, rb);
  77
  78         }
  79     }
  80
  81   /*
  82     We've done our job, so we get lost.
  83    */
  84   for (SCM s = me->get_elt_property ("elements"); gh_pair_p (s); s = gh_cdr (s))
  85     {
  86       Item * it =dynamic_cast<Item*>(unsmob_element (gh_car (s)));
  87       if (it && it->broken_b ())
  88         {
  89           it->find_prebroken_piece (LEFT) ->suicide ();
  90           it->find_prebroken_piece (RIGHT)->suicide ();
  91         }
  92       it->suicide ();
  93     }
  94   me->suicide ();
  95   return SCM_UNSPECIFIED ;
  96 }
  97
  98 void
  99 Separating_group_spanner::add_spacing_unit (Score_element* me ,Item*i)
 100 {
 101   Pointer_group_interface::add_element (me, "elements",i);
 102   me->add_dependency (i);
 103 }
 104
 105
 106 void
 107 Separating_group_spanner::set_interface (Score_element*)
 108 {
 109
 110 }